Jerrys1990
OBS Enthusiast
We tried that too. Today's update is: failure was inevitable as paragon mentioned, and I got a better looking stock intake from a coworker's friend for $20. All new gaskets were ordered and the boys at work will be swapping it out for me by Friday. The good news is, this will allow me to see if the block has the roller lifter provisions when it's disassembled. Also, the "new" intake has the correct heater hose fitting at the rear instead of the hack job plumbing pipe stuff there currently. The new GM gaskets have some restrictor looking things built in to the coolant passages and they're the ones listed for 1990....I hope that all of this will restore my heaters function to "as designed."Too late now, and I don't know if it's been tried, but for future reference, try a Mayhew Tools 37315 3/8" drive air hammer bit in a air hammer, with the appropriate socket, after letting it soak in PB Blaster and hitting with just a little bit of heat. If it fails using that method, failure was inevitable.